Android实现Service下载文件，Notification显示下载进度的示例

先放个gif。。最终效果如果：

主要演示了Android从服务器下载文件，调用Notification显示下载进度，并且在下载完毕以后点击通知会跳转到安装APK的界面，演示是在真实的网络环境中使用真实的URL进行演示，来看看代码：

MainActivity代码非常简单，就是启动一个Service：

public class MainActivity extends AppCompatActivity {
 String download_url="http://shouji.360tpcdn.com/160329/a9037075b8d3aa98fbf6115c54a5b895/com.alensw.PicFolder_4722404.apk";
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 }
 public void bt_start_service(View view){
  Intent intent=new Intent(this,DownLoadService.class);
  intent.putExtra("download_url",download_url);
  startService(intent);
 }
}

DownLoadService里面，在onStartCommand方法里面是关键代码，调用NotifyUtil这个工具类的“notify_progress”方法去显示一个通知，与此同时开始下载APK文件，DownLoadService代码如下：

public class DownLoadService extends Service {
 String download_url;
 String savePath= Environment.getExternalStorageDirectory()+"/liulan.apk";
 private int requestCode = (int) SystemClock.uptimeMillis();
 private NotifyUtil currentNotify;
 File mFile;
 @Nullable
 @Override
 public IBinder onBind(Intent intent) {
  return null;
 }
 @Override
 public void onCreate() {
  super.onCreate();
 }
 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
  mFile=new File(savePath);
  download_url=intent.getStringExtra("download_url");
  Log.e("test","执行onStartCommand");
  //设置想要展示的数据内容
  Intent intent_noti = new Intent();
  intent_noti.setAction(Intent.ACTION_VIEW);
  //文件的类型，从tomcat里面找
  intent_noti.setDataAndType(Uri.fromFile(mFile), "application/vnd.android.package-archive");
  PendingIntent rightPendIntent = PendingIntent.getActivity(this,
    requestCode, intent_noti, PendingIntent.FLAG_UPDATE_CURRENT);
  int smallIcon = R.drawable.xc_smaillicon;
  String ticker = "正在更新快图浏览";
  //实例化工具类，并且调用接口
  NotifyUtil notify7 = new NotifyUtil(this, 7);
  notify7.notify_progress(rightPendIntent, smallIcon, ticker, "快图浏览升级程序", "正在下载中",
    false, false, false, download_url, savePath, new NotifyUtil.DownLoadListener() {
     @Override
     public void OnSuccess(File file) {
      mFile=file;
      DownLoadService.this.stopSelf();
     }
     @Override
     public void onFailure(Throwable t, int errorNo, String strMsg) {
     }
    });
  currentNotify = notify7;
  return super.onStartCommand(intent, flags, startId);
 }
}

在调用“notify_progress”方法的时候，已经开始下载文件了，那么下载的代码是什么呢？如下：

public void notify_progress(PendingIntent pendingIntent, int smallIcon,
        String ticker, String title, String content,
        boolean sound, boolean vibrate, boolean lights,
        String download_url, String savePath, final DownLoadListener listener) {
  setCompatBuilder(pendingIntent, smallIcon, ticker, title, content, sound, vibrate, lights);
  
  FinalHttp fh = new FinalHttp();
  HttpHandler<File> httpHandler=fh.download(download_url, savePath, new AjaxCallBack<File>() {
   @Override
   public void onLoading(long count, long current) {
    super.onLoading(count, current);
    double a=count;
    double b=current;
    double currentPro=(double)((b/a)*100);
    cBuilder.setProgress(100, (int)currentPro, false);
    sent();
   }
   @Override
   public void onSuccess(File file) {
    super.onSuccess(file);
    cBuilder.setContentText("下载完成").setProgress(0, 0, false);
    sent();
    listener.OnSuccess(file);
   }
   @Override
   public void onFailure(Throwable t, int errorNo, String strMsg) {
    super.onFailure(t, errorNo, strMsg);
    listener.onFailure(t,errorNo,strMsg);
   }
  });
 }

这里用到了afinal.jar

这个jar已经封装好下载的工具类，我们直接拿来用就行。下载成功之后会通过DownLoadListener这个接口回调到DownLoadService里面，最终运行效果就如最上面那个gif动态图运行效果一样。

项目下载地址：点击下载

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